Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($) $ in Millions	6 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Long-term debt due within one year
Balances as of February 1, 2023	$ 4,191
Proceeds from issuance of long-term debt	0
Repayments of long-term debt	(4,063)
Reclassifications of long-term debt	2,773
Other	(4)
Balances as of July 31, 2023	2,897	$ 5,316
Long-term debt
Balances as of February 1, 2023	34,649
Proceeds from issuance of long-term debt	4,967	0
Repayments of long-term debt	0
Reclassifications of long-term debt	(2,773)
Other	(37)
Balances as of July 31, 2023	36,806	29,801
Total
Balances as of February 1, 2023	38,840
Proceeds from issuance of long-term debt	4,967	0
Repayments of long-term debt	(4,063)	$ (1,439)
Reclassifications of long-term debt	0
Other	(41)
Balances as of July 31, 2023	$ 39,703